FIGURE 1: Characterization of 20 nm AuNPs. The average size of the prepared AuNPs was measured with DLS and TEM. The distribution peaks were at 20.23 nm and 18.01 nm according to the volume and number distribution respectively (a and b), and the zeta potential of AuNPs was about -45.9±11.2 mV (c) (Malvern DTS1061). The absorption peak was at about 522 nm (d). The TEM image showed the size and shape of AuNPs (e).